Summer is officially over, and, yes, winter is coming! Which means NOW is the time to get outside, enjoy the cooler temperatures and burn some major calories!

We asked Jim White, American College of Sports Medicine Certified Personal Trainer, and exercise physiologist Tom Holland, author of Beat the Gym: Personal Trainer Secrets--Without the Personal Trainer Price Tag, to give us their top ideas for getting your butt in gear in the great outdoors this fall. And yes, roller skating is on the list!

1. Stadium stairs -
“Get over to your local football field and enjoy the amazing fall weather while blasting over 200 calories in 15 minutes of running up and down the stairs,” says Holland. “Great for leg and butt toning, too!”

2. Outdoor kettlebell classes – “Blast calories fast with the simple cannonball with a handle,” says Holland, adding that kettlebell classes usually last around 60 minutes. “The harder you work, the more calories you will burn!”

3. Outdoor CrossFit/Strongman workouts – Holland says, “You’ll flip tires, pick up stones and sprint until your body says no more!” Since these classes involve some extremely challenging moves, Holland recommends being sure to take a class with a qualified instructor.

4. Trail fun run – “Mix simple strength moves into your trail run to add strength and toning moves to your cardio,” says Holland. “Run until you come to a bench, then do a round of step-ups. Fallen log? Jump up and down on it for one minute.” Holland says you can do walking lunges after a few more minutes of running, bench dips on the next bench, etc. Mix it up! 200 calories burned in 20 minutes.

5. Roller skating! - Ah, memories of junior high! According to White, roller skating is a great outdoor activity to obliterate unwanted pounds. “It’s less jarring and easier on the knees and joints than running, but has all the cardiovascular benefits,” he says. “A 30-minute glide through the neighborhood can burn 250 calories.”

6. Obstacle course – “Design your own personal ‘Spartan Race’ — an obstacle course in your backyard or local park,” says Holland. Use whatever equipment you have to make a fun and challenging circuit: medicine balls, kettlebells, water bottles for cones for sprints, boxes to jump over, etc. Holland says you can burn 200 calories in 20 minutes!

7. Stand-up paddleboarding – Holland says this is a great way to get your last summer fix on the water! Check out SELF’s how-to here. Speaking of the water…

8. Kayaking – It’s still warm enough to do a little kayaking. White says paddling for an hour is a great upper-body workout that can burn 350 calories. Not sure how to get started? Check out SELF’s Beginner’s Guide to Outdoor Sports!

9. Hiking – Seriously, is there any better, more beautiful time of the year to be out in nature? “If the mountains are not at your disposal, there are plenty of beautiful state parks around the country touting trails of all levels,” says White, adding that in just 30 minutes, hiking can burn 200-plus calories! “The more rugged and hilly the terrain, the more calories burned,” he adds.

10. Cycling – “Depending on speed and surface, biking for an hour can burn up to a whopping 800 calories,” says White. (Woah!) “Biking is a great cardiovascular workout, not to mention a great way to tone the quads and calves,” he says. “Ride a bike to work and you can burn a leisurely 250 calories in 30 minutes; take your bike off road and increase the burn to 400 calories in that same 30 minutes!”